Stretches for Latissimus Dorsi The latissimus dorsi is responsible for extension, adduction, transverse extension also known as horizontal abduction (or horizontal extension), flexion from an extended position, and (medial) internal rotation of the shoulder joint. It also has a synergistic role in extension and lateral flexion of the lumbar spine. View Video :- https://www.youtube.com/watch?v=ltdHapRXzKM